Automatic damper control



Aug-- 18, 1925.

1,549,917 A M. MERTZANOFF ET AL AUTOMATIC DAMPER CONTROL Original Filed April 15, 1918 4 Sheets-Sheet l W/T/VESSES M (PW Aug. 18,1925. 1,549,917

A. M. MERTZANOFF ET AL 1 AUTOMATIC DAMPER CONTROL INVENTORS (fill/5568 v M wmflg m Ma -g,

Aug. 18, 1925.

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1,549,917 A. M. MERTZANOFF ET AL 7 AUTOMATIC DAMPER CONTROL Filed April 15 1918 4 Sheets-Sheet 5 INVENTORS Aug. 18, 1925. 1,549,917

A. M. MERTZANOFF ET AL AUTQIIATIC DAMPER CONTROL ril 15 4 Sheets-Sheet 4 MIA/8863 MMW tar 6M4 mu. ATTORNEY Patented Aug. 18, 192 5,.

UNITED STATES PATENT OFFICE.

ANDRE M. MERTZANO'FF, LEWIS W. EGGLESTON, AND FREDERICK G. GREGORY, OF

BUFFALO, NEW YORK, ASSIGNORS T0 AMERICAN RADIATOR COMPANY, 015 (II-IL CAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

AUTOMATIC DAMPER CONTROL.

Application filed A ril 15, 1918, Serial: No. 228,586. Renewed November 10, 1924.

To all whom it concern:

Be it known that we, ANDRE M. MEET- ZANOFF, a subject of the King of Greece, and Lnwrsi W. EoeLnsToN and FREDERICK G. GREGORY, citizens of the United States, all residing at Buffalo, Erie County, in the State of New York, have invented certain new and useful Improvements in Automatic Damper Controls, of which the following is a full, clear, and exact specification.

Our invention relates to improvements in heating apparatus, and the same has for its object more particularly to provide a reliable and eflicient device for regulating the rzite of fuel consumption in a boiler or the li re.

Further, the said invention has for its object to provide means for controlling the dampers of theboiler or the like to insure an exact and even regulation of the draft therethrough.

Further, the invention has for its object to provide adjustable means for controlling the dampers whereby the relative opening and closing of the same may be varied.

Further, the invention has for its object to provide for the forming of an air tight joint when the damper is in its closed position thus insuring that there will be no leakage of air through the air inlet opening controlled by the damper. 7

Other objects will in part be obvious and in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends our invention consists in the novel details of construction, and in the combination, connection and arrangement of parts hereinafter more fully described and then pointed out in the claim.

"In the accompanying drawings showing an illustrative embodiment of the invention Figure l is a view in side elevation of a heating boiler equipped with the improved regulator;

Fig. 2 is a side elevational view of the regulator, parts being broken away;

, Fig. 3 is a plan view thereof, and

Fig. 4 is a detail View in rear elevation, parts being broken away.

In said drawings 10 designates a downdraft boiler of any suitable type having a cold air inlet opening 10 at its rear side adjacent to the base communicating with the portion of the boiler below the grate. 11

denotes a hollow, flanged casting secured to the rear of the boiler over said inlet opening 10. The casting 11 has a flat inclined top provided with an air inlet opening 12 communicating with the cold air inlet l0 aforesaid.

Upon the inclined top of the casting 11 and adjacent to the upper edge of the opening 12 is secured by screws 1E2 a U-shaped frame 14 provided at the ends of its leg members with upwardly extending bearing lugs 14*, 14

Upon said U-shaped frame 14 is mounted a butterfly damper comprising two plates or sections 13, 13 having their overlapping longitudinal edges secured together by screws 14*, 14 The plate or section 13 is provided at its opposite ends adjacent to its secured longitudinal edge with lugs 13*, 13, disposed between the bearing lugs 14*,

1 14 of the U-shaped frame 12,and pivotally supported upon pivots 14, 14 secured in said bearing lugs 14, 14*.

In order to prevent undue leakage of air into the casting 11 when the damper is closed, the upper side of the plate or section 13 and the under side of the frame 14 co-acting therewith, as well as the upper edge of the casting 11 and the under side of the plate or section 13 co-acting therewith are formed with ground surfaces to insure a tight joint when the parts are in contact.

.By forming the frame 14, whose under side forms the seat for the plate or section 13; the butterfly damper plates or sections 13 and 13 and the casting 11, as separate parts which are subsequently secured together in operative arrangement, it becomes possible to so grind or face separately the contacting surfaces of the several parts as to permit of the accurate adjustment of the same with respect to each other.

Adjacent the lower portion of the boiler and communicating with the upper por tion thereof by suitable flues Within the boiler is a fine provided with an outlet- 16 to which the smoke pipe is connected in the usual manner. The flue 15 is provided with an air inlet opening 17 within which is secured a frame 18 having inwardly extending flanges forming a seat 19 for a damper 20 when the same is in its closed position. The co-acting surfaces of the air inlet opening 17 and the frame 18 are ground, asis also the valve seat 19 and the co-acting surface of the damper 20, thereby insuring that an air tight joint is formed when the damper is closed. The damper 20, which is provided with a depending, inclined portion 20, is carried by one end of a curved arm 21 which passes through the opening 17 and has its other end secured to a rock shaft 22 rotatably mounted upon the frame 18. A rearwardly extending arm 23 also secured to the rock shaft 22 carries an adjustable weight 2a which acts to normally close the damper 20.

Pivotally mounted upon the top of the boiler 10 is an operating lever 25 operatively connected to the dampers 13, 13 and 20 as hereinafter described, and which is automatically actuated in accordance with variations of temperature or pressure by any suitable mechanism. As shown the lever 25 is actuated by the expansible and collapsible vessel 26 of a thermostatic controlling device actuated by the boiler.

An adjustable weight 27 is mounted upon the lever 25 at one side of its pivotal point of support, and a pair of adjustable damper controlling rods 28 and 29 are pivotally secured to the lever 25 at the other side of its point of support.

The rod 28 passes freely through an eye 30 formed in the outer end of an arm 31 carried by the damper 13, 13 and is provided at its lower end with an arm-engaging portion 32. The rod 29 passes freely through an eye 33 formed in the outer end of an arm 34 secured to the rock shaft 22 and carries intermediate its ends an arm engaging member 35 which is positioned above the eye 33 and is of such size that its can not pass therethrough.

The operation is as follows:

Assuming the vessel 26 to be expanded to its full extent the parts will occupy the positions shown in full lines in Fig. 2, in which the end of the lever 25, to which the rods 28 and 29 are connected, is in its lowermost position. The damper 20 is fully opened, being held in such position by the engagemerit of the member 35 upon the rod 29 with the outer end of the arm 3 1. The damper 13, 13 is closed and the arm-engaging portion 32 at the lower end of the rod 28 is out of engagement with the outer end of the arm 31 whereby the rod 28 may move upward a predetermined distance before the portion 32 will engage the arm 31. In this position of the dampers 13, 13 and 20 no air is admitted into the ash-pit below the grate and the maximum amount of air is admit-ted into the line 15 which communicates with the smoke pipe, and at the same time the damper 20 serves to check the flow of gases from the boiler through the flue 15 and this checking-action is augmented by the depending portion 20 which, when the damper 20 is fully opened, assumes a substantially vertical position within the flue 15.

If the temperature within the boiler falls the vessel 26 will collapse thereby causing the outer end of the lever 25, and the rods 28 and 29 which are connected thereto, to rise. As the rod 29 rises the damper 20 will be moved toward its seat 19 by the action. of the weight 24 on the arm 23, but the damper 13, 13 will remain closed until the rod 28 has moved upwardly a sufficient distance to cause the end portion 32 thereof to engage the arm 31, after which a continued upward movement of the rod 28 will cause the damper 13, 13 to open.

lVhen the vessel 26 has collapsed to its full extent the parts will occupy the positions indicated in dotted lines in Fig. 2, the damper 13, 13' being fully opened and the damper 20 being closed, in which positions of the dampers the fire within the boiler will be subjected to its maximum draft. The armengaging member 35 is so positioned upon the rod 29 that when the rod is in its uppermost position the member 35 will be lift-ed out of engagement with the outer end of the arm 34.

If the vessel 26 now expands, the outer end of the lever 25 and the rods 28 and 29 will be moved downward, the damper 13, 13 will immediately start to close but the damper 20 will not be opened until the rod 29 has moved down-ward sufficiently to cause the member 35 to engage the outer end of the arm 34.

If desired the rods 28 and 29 may be so adjusted as to insure the closing of either one of the dampers before the other one thereof is opened.

.Having thus described our said invention what we claim and desire to secure by Letters Patent is The combination with a furnace having an air inlet for admitting air into the base thereof, of a smoke flue having an air inlet for admittin air therein, dampers to control the flow of air through said air inlets, each of said dampers being provided with an arm having an eye formed therein, an operating lever responsive to conditions within the furnace, and rods having their upper ends secured tosaid lever and their lower ends passing freely through the eyes in said arms, said rods being provided with means to engage said arms whereby to actuate said dainpers, the means associated with one of said rods being positioned above the arm with which it engages, and the means associated with the other of said rods being positioned below the arm with which it engages, substantially as specified.

Signed at the city of Buffalo, Erie County, in the State of New York, this 5th day of April, one thousand nine hundred and seventeen.

ANDRE M.'NIERTZANO:FF. FREDERICK G. GREGORY.

LEWIS W. EGGLESTON. 

